还可以在useEffect中定义执行函数

useEffect(() => {
    ...
    async main() {
        await getDataZero() 
        await getDataOne()
        await getDataTwo()
    }
    main()
}, [])

我已经修改了你的代码，在某种程度上，它将等待每个承诺，然后移动到下一个。

import './App.css';
import { useEffect } from 'react';
import axios from 'axios';
function App() {

  useEffect( async () => { // <--- use async here
    async function getDataZero() {
      const res = await axios.get(`https://pokeapi.co/api/v2/pokemon/1`);
      console.log("res-0",res)
    }

    async function getDataOne() {
      const res = await axios.get(`https://jsonplaceholder.typicode.com/todos/1`);
      console.log("res-1",res)
    }

    async function getDataTwo() {
      const res = await axios.get(`https://pokeapi.co/api/v2/pokemon`);
      console.log("res-2",res)
    }

   await getDataZero(); // <--- await keyword in front of each function
   await getDataOne();
   await getDataTwo();

  }, [])

  return (
    <div className="App">
      <header className="App-header">
        <p>React app</p>
      </header>
    </div>
  );
}

export default App;

useEffect(() => {
    async function getDataZero() {
      const res = await axios.get(`https://pokeapi.co/api/v2/pokemon/1`);
      console.log("res-0",res)
    }

    async function getDataOne() {
      const res = await axios.get(`https://pokeapi.co/api/v2/pokemon`);
      console.log("res-1",res)
    }

    async function getDataTwo() {
      const res = await axios.get(`https://jsonplaceholder.typicode.com/todos/1`);
      console.log("res-2",res)
    }

    getDataZero();
    getDataOne();
    getDataTwo();

  }, [])